Support Chrome Endure graphs in perf dashboard.

dashboard/ui/endure_js/endure_plotter.js

Index: dashboard/ui/endure_js/endure_plotter.js
diff --git a/dashboard/ui/endure_js/endure_plotter.js b/dashboard/ui/endure_js/endure_plotter.js
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+/*
+  Copyright (c) 2012 The Chromium Authors. All rights reserved.
+  Use of this source code is governed by a BSD-style license that can be
+  found in the LICENSE file.
+*/
+
+/**
+ * @fileoverview Handles drawing a general Chrome Endure graph.
+ */
+
+document.title = Config.title + ' - ' + Config.buildslave;
+
+var unitsX = 'unitsX';
+var unitsY = 'unitsY';
+var unitsYOther = null;
+var graphList = [];
+var revisionNumbers = [];
+var graphDataOtherRows = null;
+
+var eventRows = null;
+var eventTypes = [];
+var eventInfo = null;
+
+var params = ParseParams();
+
+/**
+ * Encapsulates a *-summary.dat file.
+ * @constructor
+ *
+ * @param {string} data Raw data from a *-summary.dat file.
+ */
+function Rows(data) {
+  this.rows = data.split('\n');
+  this.length = this.rows.length;
+}
+
+/**
+ * Returns the row at the given index.
+ *
+ * @param {number} i The index of a row of data from the *-summary.dat file.
+ * @return {Object} An object representing a row of data from the input file.
+ */
+Rows.prototype.get = function(i) {
+  if (!this.rows[i].length) return null;
+  var row = jsonToJs(this.rows[i]);
+  row.revision = isNaN(row['rev']) ? row['rev'] : parseInt(row['rev']);
+  return row;
+};
+
+/**
+ * Gets the current URL, but without the 'lookout' parameter.
+ *
+ * @return {string} The current URL, but without the 'lookout' parameter.
+ */
+function get_url() {
+  new_url = window.location.href;
+  new_url = new_url.replace(/\&lookout=1/, '');
+  return new_url;
+}
+
+/**
+ * Reports an error message on the webpage.
+ *
+ * @param {string} error An error message to display on the page.
+ */
+function reportError(error) {
+  document.getElementById('output').innerHTML = '<p>' + error + '</p>';
+}
+
+/**
+ * Converts a JSON string into a Javascript object.
+ *
+ * @param {string} data A string in JSON format.
+ * @return {Object} A Javascript object computed from the JSON string.
+ */
+function jsonToJs(data) {
+  return JSON.parse(data)
+}
+
+/**
+ * Causes the page to navigate to another graph.
+ *
+ * @param {string} graph The name of the graph to which to navigate.
+ */
+function goTo(graph) {
+  params.graph = graph;
+  window.location.href = MakeURL(params);
+}
+
+/**
+ * Returns a function that will navigate the page to another graph.
+ *
+ * @param {string} graph The name of the graph to which to navigate.
+ * @return {Function} A function that will navigate the page to another graph.
+ */
+function goToClosure(graph) {
+  return function(){goTo(graph)};
+}
+
+/**
+ * Changes the event being overlayed on the graph.
+ *
+ * @param {string} eventName The name of the event to overlay on the graph.
+ */
+function changeEventCompare(eventName) {
+  delete params.revisionOther;
+  delete params.graphOther;
+  if (eventName == 'None') {
+    delete params.event;
+    window.location.href = MakeURL(params);
+  } else {
+    params.event = eventName;
+    window.location.href = MakeURL(params);
+  }
+}
+
+/**
+ * Changes the other measurement being overlayed on top of an original line on
+ * the graph.
+ *
+ * @param {string} graphName The name of the other graph to overlay on top of
+ *     the existing graph.
+ */
+function changeMeasurementCompare(graphName) {
+  delete params.revisionOther;
+  delete params.event;
+  if (graphName == 'None') {
+    delete params.graphOther;
+    window.location.href = MakeURL(params);
+  } else {
+    params.graphOther = graphName;
+    window.location.href = MakeURL(params);
+  }
+}
+
+/**
+ * Changes the number of the other revision to compare against on the graph.
+ *
+ * @param {string} revision The revision number of the other line to plot on
+ *     the graph.
+ */
+function changeRevisionCompare(revision) {
+  delete params.graphOther;
+  delete params.event;
+  if (revision == 'None') {
+    delete params.revisionOther;
+    window.location.href = MakeURL(params);
+  } else {
+    params.revisionOther = revision;
+    window.location.href = MakeURL(params);
+  }
+}
+
+/**
+ * Changes the displayed revision number of the graph line.
+ *
+ * @param {string} revision The revision number of the graph to display.
+ */
+function changeRevision(revision) {
+  delete params.revisionOther;
+  delete params.graphOther;
+  delete params.event;
+  params.revision = revision;
+  window.location.href = MakeURL(params);
+}
+
+/**
+ * Initializes the UI for changing the revision number of the displayed graph.
+ */
+function initRevisionOptions() {
+  var html = '<table cellpadding=5><tr><td>';
+  html += '<b>Chrome revision:</b>&nbsp;';
+  html += '<select onchange=\"changeRevision(this.value)\">';
+  for (var i = 0; i < revisionNumbers.length; ++i) {
+    html += '<option id=\"r' + revisionNumbers[i] + '\"';
+    if (revisionNumbers[i] == params.revision)
+      html += 'selected=\"true\"';
+    html += '>' + revisionNumbers[i] + '</option>';
+  }
+  html += '</select></td></tr></table>';
+
+  document.getElementById('revisions').innerHTML = html;
+}
+
+/**
+ * Initializes the UI for changing what is compared against the current line
+ * on the displayed graph.
+ */
+function initComparisonOptions() {
+  var html = '<table cellpadding=5>';
+  html += '<tr><td><b>Compare with (select one):</b></td></tr>';
+
+  html += '<tr><td>&nbsp;&nbsp;&nbsp;Another run:&nbsp;';
+  html += '<select onchange=\"changeRevisionCompare(this.value)\">';
+  html += '<option selected=\"true\">None</option>';
+  for (var i = 0; i < revisionNumbers.length; ++i) {
+    html += '<option id=\"r' + revisionNumbers[i] + '\"';
+    if (revisionNumbers[i] == params.revisionOther)
+      html += 'selected=\"true\"';
+    html += '>' + revisionNumbers[i] + '</option>';
+  }
+  html += '</select></td></tr>'
+
+  html += '<tr><td>&nbsp;&nbsp;&nbsp;Another measurement of same run:&nbsp;';
+  html += '<select onchange=\"changeMeasurementCompare(this.value)\">';
+  html += '<option selected=\"true\">None</option>';
+  for (var i = 0; i < graphList.length; ++i) {
+    var graph = graphList[i];
+    html += '<option id=\"r' + graph.name + '\"';
+    if (graph.name == params.graphOther)
+      html += 'selected=\"true\"';
+    html += '>' + graph.name + '</option>';
+  }
+  html += '</select></td></tr>';
+
+  html += '<tr><td>&nbsp;&nbsp;&nbsp;Event overlay:&nbsp;';
+  if (eventTypes.length >= 1) {
+    html += '<select onchange=\"changeEventCompare(this.value)\">';
+    html += '<option selected=\"true\">None</option>';
+    for (var i = 0; i < eventTypes.length; ++i) {
+      var eventType = eventTypes[i];
+      html += '<option id=\"' + eventType + '\"';
+      if (eventType == params.event)
+        html += 'selected=\"true\"';
+      html += '>' + eventType + '</option>';
+    }
+    html += '</select>';
+  } else {
+    html += '&nbsp;<i><font size=-1>No events for this revision</font></i>';
+  }
+  html += '</td></tr></table>';
+
+  document.getElementById('comparisons').innerHTML = html;
+}
+
+/**
+ * Initializes the UI for the tabs at the top of a graph to change the displayed
+ * line.
+ */
+function initPlotSwitcher(tabs) {
+  var switcher = document.getElementById('switcher');
+  for (var i = 0; i < tabs.length; ++i) {
+    var is_selected = tabs[i] == params.graph;
+    var tab = document.createElement(is_selected ? 'span' : 'a');
+    tab.appendChild(document.createTextNode(tabs[i] + ' '));
+    if (!is_selected)
+      tab.addEventListener('click', goToClosure(tabs[i]), false);
+    switcher.appendChild(tab);
+  }
+}
+
+/**
+ * Adds data to existing arrays indicating what data should be plotted.
+ *
+ * @param {number} revisionNum The revision number of the data to plot.
+ * @param {Rows} dataRows The |Rows| object containing the plot data.
+ * @param {Array} plotData A list of data lines to plot, to which new data will
+ *     be appended.
+ * @param {Array} dataDescriptions A list of string descriptions corresponding
+ *     to data lines in |plotData|, to which new data will be appended.
+ * @return {Object} A row object specified by {@code revisionNum} on success,
+ *     otherwise returns null.
+ */
+function addToPlotData(revisionNum, dataRows, plotData, dataDescriptions) {
+  // Get data for the revision number(s) to plot.
+  var found = false;
+  for (var i = 0; i < dataRows.length; ++i) {
+    var row = dataRows.get(i);
+    if (row && row.revision == revisionNum) {
+      found = true;
+      break;
+    }
+  }
+  if (!found) {
+    return null;
+  }
+
+  if (row.stack) {
+    if (!row.stack_order) {
+      reportError('No stack order was specified.');
+      return null;
+    }
+    var traceList = row.stack_order;
+  } else {
+    // Identify the (single) trace name associated with this revision.
+    var traceName = null;
+    for (var t in row.traces) {
+      if (traceName) {
+        reportError('Only one trace per revision is supported for ' +
+                    'non-stacked graphs.');
+        return null;
+      }
+      traceName = t;
+    }
+    var traceList = [traceName];
+  }
+
+  var lines = [];
+  for (var i = 0, traceName; traceName = traceList[i]; ++i) {
+    var trace = row.traces[traceName];
+    if (!trace) {
+      reportError('No specified trace was found.');
+      return null;
+    }
+
+    var points = [];
+    for (var j = 0, point; point = trace[j]; ++j) {
+      points.push([parseFloat(point[0]), parseFloat(point[1])]);
+    }
+    lines.push(points);
+    dataDescriptions.push(traceName + ' [r' + row.revision + ']');
+  }
+
+  if (row.stack) {
+    lines = graphUtils.stackFrontToBack(graphUtils.interpolate(lines));
+  }
+
+  for (var i = 0, line; line = lines[i]; ++i) {
+    plotData.push(line);
+  }
+
+  return row;
+}
+
+/**
+ * Callback for when a *-summary.dat data file has been read.
+ *
+ * @param {string} data The string data from the inputted text file.
+ * @param {string} error A string error message, in case an error occurred
+ *     during the file read.
+ */
+function receivedSummary(data, error) {
+  if (error) {
+    reportError(error);
+    return;
+  }
+
+  var errorMessages = '';
+  var rows = new Rows(data);
+
+  // Build and order a list of revision numbers.
+  revisionNumbers = [];
+  for (var i = 0; i < rows.length; ++i) {
+    var row = rows.get(i);
+    if (!row)
+      continue;
+    revisionNumbers.push(row.revision);
+  }
+  revisionNumbers.sort(
+      function(a, b) { return parseInt(a, 10) - parseInt(b, 10) });
+
+  // Get the revision number to plot.
+  if (!('revision' in params) || params.revision == '') {
+    if (revisionNumbers.length >= 2 && 'lookout' in params) {
+      // Since the last graph (test run) might still be in progress, get the
+      // second-to-last graph to display on the summary page.  That one
+      // is assumed to have finished running to completion.
+      params.revision = revisionNumbers[revisionNumbers.length-2];
+    } else {
+      if (revisionNumbers.length >= 1) {
+        params.revision = revisionNumbers[revisionNumbers.length-1];
+      } else {
+        reportError('No revision information to plot.');
+        return;
+      }
+    }
+  }
+
+  var plotData = [];  // plotData is a list of graph lines; each graph line is
+                      // a list of points; each point is a list of 2 values,
+                      // representing the (x, y) pair.
+  var dataDescriptions = [];
+
+  var row = addToPlotData(params.revision, rows, plotData, dataDescriptions);
+  if (!row) {
+    errorMessages += 'No data for the specified revision.<br>';
+  }
+  // From index {@code plotData.length} onwards, any graph lines in
+  // {@code plotData} are considered to be part of a second set of graphs.
+  var graphsOtherStartIndex = plotData.length;
+
+  var rowOther = null;
+  if ('revisionOther' in params) {
+    rowOther = addToPlotData(params.revisionOther, rows, plotData,
+                             dataDescriptions);
+    if (!rowOther)
+      errorMessages += 'No data for the revision to compare against.<br>';
+  }
+
+  if ('graphOther' in params) {
+    rowOther = addToPlotData(params.revision, graphDataOtherRows, plotData,
+                             dataDescriptions);
+    if (rowOther) {
+      for (var i = 0; i < graphList.length; ++i) {
+        if (graphList[i].name == params.graphOther) {
+          unitsYOther = graphList[i].units;
+          break;
+        }
+      }
+    } else {
+      errorMessages += 'No data for the measurement to compare against.<br>';
+    }
+  }
+
+  // Identify the events for the current revision.
+  if (eventRows) {
+    for (var index = 0; index < eventRows.length; ++index) {
+      var info = eventRows.get(index);
+      if (params.revision == info['rev']) {
+        eventInfo = info;
+        break;
+      }
+    }
+    if (eventInfo != null) {
+      for (var key in eventInfo['events']) {
+        eventTypes.push(key);
+      }
+    }
+  }
+
+  // Get data for the events to display, if one was requested in the params.
+  var eventNameToPlot = null;
+  var eventInfoToPlot = null;
+  if ('event' in params && eventInfo != null) {
+    for (var key in eventInfo['events']) {
+      if (key == params['event']) {
+        eventInfoToPlot = eventInfo['events'][key];
+        eventNameToPlot = key;
+      }
+    }
+  }
+
+  // Draw everything.
+  if (errorMessages == '') {
+    var plotter = new Plotter(
+        plotData,
+        dataDescriptions,
+        eventNameToPlot, eventInfoToPlot,
+        unitsX, unitsY, unitsYOther, graphsOtherStartIndex,
+        document.getElementById('output'),
+        'lookout' in params,
+        !!row.stack,
+        rowOther && !!rowOther.stack);
+
+    plotter.plot();
+  } else {
+    errorMessages = '<br><br><br><table border=2 cellpadding=5><tr><td>' +
+                    errorMessages + '</td></tr></table><br><br>';
+    document.getElementById('output').innerHTML = errorMessages;
+  }
+
+  if (!('lookout' in params)) {
+    initRevisionOptions();
+    initComparisonOptions();
+  }
+}
+
+/**
+ * Callback for when a second *-summary.dat data file has been read, in the
+ * event that a second graph line is being overlayed on top of an existing
+ * graph line.
+ *
+ * @param {string} data The string data from the inputted text file.
+ * @param {string} error A string error message, in case an error occurred
+ *     during the file read.
+ */
+function receivedSummaryGraphOther(data, error) {
+  if (error) {
+    reportError(error);
+    return;
+  }
+
+  graphDataOtherRows = new Rows(data);
+  Fetch(escape(params.graph) + '-summary.dat', receivedSummary);
+}
+
+/**
+ * Callback for when an event info file has been read.
+ *
+ * @param {string} data The string data from the inputted text file.
+ * @param {string} error A string error message, in case an error occurred
+ *     during the file read.
+ */
+function receivedEvents(data, error) {
+  if (!error)
+    eventRows = new Rows(data);
+  fetchSummary();
+}
+
+/**
+ * Callback for when a graphs.dat data file has been read.
+ *
+ * @param {string} data The string data from the inputted text file.
+ * @param {string} error A string error message, in case an error occurred
+ *     during the file read.
+ */
+function receivedGraphList(data, error) {
+  if (error) {
+    reportError(error);
+    return;
+  }
+  graphList = jsonToJs(data);
+
+  if (!('graph' in params) || params.graph == '')
+    if (graphList.length > 0)
+      params.graph = graphList[0].name
+
+  // Add a selection tab for each graph, and find the units for the selected
+  // one while we're at it.
+  tabs = [];
+  for (var index = 0; index < graphList.length; ++index) {
+    var graph = graphList[index];
+    tabs.push(graph.name);
+    if (graph.name == params.graph) {
+      unitsX = graph.units_x;
+      unitsY = graph.units;
+    }
+  }
+  initPlotSwitcher(tabs);
+
+  fetchEvents();
+}
+
+/**
+ * Starts fetching a *-summary.dat file.
+ */
+function fetchSummary() {
+  if ('graphOther' in params) {
+    // We need to overlay a second graph over the first one, so we need to
+    // fetch that summary data too.  Do it first.
+    Fetch(escape(params.graphOther) + '-summary.dat',
+          receivedSummaryGraphOther);
+  } else {
+    Fetch(escape(params.graph) + '-summary.dat',
+          receivedSummary);
+  }
+}
+
+/**
+ * Starts fetching an event info file.
+ */
+function fetchEvents() {
+  Fetch('_EVENT_-summary.dat', receivedEvents);
+}
+
+/**
+ * Starts fetching a graphs.dat file.
+ */
+function fetchGraphList() {
+  Fetch('graphs.dat', receivedGraphList);
+}
+
+window.addEventListener('load', fetchGraphList, false);